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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f953f75ed382b51b94d88778164a53b9a18a498f051fb4d841a00d7a5aae2f4' 
  AND token = 'bBdyaNG84QYS8NALAK/jKh7OHz6QKXNFl1xG55UCE40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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