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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54306743262b0b07ccd050aa87144361bd8c0ee791456311078fca754ae4902b' 
  AND token = 'YXf4ODVfgU2sl0THr+fQOUFXukcJEGcgmEMl1n1b20g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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