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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08a4e5bdd5dc3c8e70aff59c22177ebe0ad59e780109caa93c55aa770bf7e027' 
  AND token = 'Cx3CT+5HneED/bZlSLPLRlDFVjar/UdnyrhSyMLfHX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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