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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eea889c0e845fef087388fefa730f47cf0757fbe509c17fdbe1e9aedebdb7c90' 
  AND token = '3bMABn8tzFJ+G+06Ck0lYveV/DRvgJLP1H+e/Md7Epo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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