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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30c0a1e5881ef91c4c86c1a3642b451e0dc5785597d87eb5fae9148efd3fbd76' 
  AND token = 'hhUNZw+fq1lx2dPzigi63s7fEIpf7bsswlP/tqakuy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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