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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bed66d9a2d3a0762847d643af961d675c63cd9446f6e08f247b807ace3a031a' 
  AND token = 'zpyFwhToh1hSuqZ0NMAcEOsV9U9/+N8PRN89HBBALRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}