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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d3c958879795c8f39690b0a6c6116d9d49f8b0ecc36e9b3a1dcac8203a76a58' 
  AND token = '/djB66qr/QuG/n8DM0qrPPsrftDkuQoAJ0gTDgk3EQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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