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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ee47548cf3f7909c300a646d3a8ae9e8e5a1c6f13fb875fac281e4fbb9b8aea' 
  AND token = '41l8WJzfEu+cclSJarV49r41klmM8HjJLrldxp9Neao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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