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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc5d978f76bbbfd77d1afd553fcd68ea6111a1b0ef05b4447b52e3535c494e9c' 
  AND token = 'OIIaxg/SDtjQOY0kCNpFsVZNFXwOa2L1LM/V2/iydFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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