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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b6f12da37de952db1a7c71e8c0b977876b17147c75abaa566beebe2bc8b8a44' 
  AND token = 'JX5SDA0BE73S0Ag7DH68t6mjL2JxtVDTuTRvl+y90Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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