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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9e7c73dbe93aa0515ad951225039c8aac8020ec6e8edec639f9e3fc9939638c' 
  AND token = 'zaB8K1HqgieRXa7HetIwSP6WKZfRE6G3GCYttWQ68CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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