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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cee98b358d24868f2aa73b0fa12363f60335abe72f77aed7d30e5f2150e6aa37' 
  AND token = 'KNGQc5ImIL/0RlVfHyfCrSIbrt0EH19+7Mn+30drtLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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