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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dadc35a0afff0435e96fef6782bc9c64945fbd6b0266c23d6c0fa95004f3e58d' 
  AND token = '5z32tL/UdcFmYDUgoAU9FeEjQczQj3bDNmJxTrL7nVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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