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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bc63c158df56a6d5f740bf5f1b9e9e9ba199e0cf5d3aedd5f8ee45d63d24122' 
  AND token = 'PMaqSG4v6rO+yZZ/G6sqqunE2njWt7SgZIOnfp74VsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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