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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e4affdb90c8de1f21ee45dc8ba3adb4879c14164f49f964c48fa398c8dd5629' 
  AND token = 'zAjFeKLCNTPv6ux5jEcUCZSo7u9wwzowFWNQKDweUT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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