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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d94a795459591de80468f07e3987eb194ba1cd3ff09e30d3ca3e60fe2a8958' 
  AND token = 'aGyzWZGAqs8sxAiaVpWhTwzss2f/0J3NSp9QdmWy6rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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