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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46d3222d41e844c608f2e09d10c7e1811f628139f2894a7ce862c55a819c303' 
  AND token = '7Zyaw7a4wpnkT3aPeqJVSFeCnn1J+bXNJoOJ0zT77Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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