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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37a76986780b090cba99b9c8894752df1db57e5e6fa9cc1a925b8fcad330da80' 
  AND token = 'VQ9scmf4vIaF/Z/dWjT1lScJjidQ9gS17sK3+Frqoq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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