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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a955bd3dfd2a1335a4a9138192d812909200aa219cdf164a7b6db236d6e11546' 
  AND token = 'Ak/rWojVSMpQIcAprOT0fAWUcSgtZy6AIv8TQdnAwG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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