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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17939209047dc53f56afbad7dd8370f185d07d3d0ef5d856aa96fed7e132d213' 
  AND token = 'tIG59EF06Uh043nTnTApl/xf67gWfF+oP79toTVMSmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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