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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8668c4cc3b6912dbdc91fac53ff6c87941b0297fe542aad54c8c18832d6de2e' 
  AND token = 'KFRHeT8HuNDvl9TbanwGVyd6fzN8esyCanrH7msfZ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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