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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56845964ce1878ea33ea90af5ec7508d376cf6cb7eab86fa5a602f27019870b8' 
  AND token = 'tzMnDfNTsl384FZcLMo3YNlJkr1WFNGKeQj5Zs2b0hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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