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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4cba35c3dde53f91c070d9340163eb996f1e6ba3de08dc90830152490281729' 
  AND token = 'HH1F1LhvJ8HLmCpj2ncHDeSrV/90H+JOG+0J93IJ7I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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