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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52d7cfa7e5c4e5673910e06844e0acd1591afffb0b7585c9de5725ed0dabd942' 
  AND token = 'DXhGvxz5AL6eANJ2OEy1Iawoc5+KsKufrJnO5xNKqN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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