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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '812a2dcf277b707c68a367a46d49a14eac4e20e6522411215fd721eb16fe8f7b' 
  AND token = 'qd6g3BNtn4od9EECbhtl7J2Sh7oIkGM94d/FOElLDCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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