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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6b3185db4a278107dbc3183f66106cab42f2abf0d92d47a6dbdd37ef12d80b9' 
  AND token = 'uH1QU2g28KfY7K3M8+3bvHHIQTl4BfFTYLd13utSjHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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