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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a652e101b85c09ee19f0689c4df72fa7900afa8a5a47339684ad4fa737af4e2' 
  AND token = '7I07qG/5wSupT3sx+4cdJFic94Ew/O2n2wrcEz3Yfac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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