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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea032f66cbd7ce5ce93dd3ad576e26a882f11f2ce846a882c8b57a9fbc59015f' 
  AND token = 'T+OFEJqTDt2M+yMqLa9G1CMLy6Qy+dYKBGpk4SEVyVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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