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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc3e8516ec95c4bb5f9e953449107011a0628aaaf19072e2aec0a39e92daf831' 
  AND token = 'xA4MJqan49sJ6udI2JW+1Aqq5ShK06LBW4XaPxF4abY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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