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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7685a026870b01c7ae43b33df641c72e4bb5987f9d2dc48300a986fe94e216b4' 
  AND token = 'ljeHgA9/b/nO77HlauDEb9MylUJGl+L6KWmza+ierK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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