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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8ee4f02da3dd1c74460789545def2a0341cdefc4b8fb43759ecc2b8987fba9d' 
  AND token = 'nx58CciUUabn52EkVeIyBHhfI4RZ2Xv638g2le8K37g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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