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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191fd63c8855ad3b76a374cf32b7e6f99a3caa4d12ddd1ae21d5f6e409e87549' 
  AND token = '+l8PI0r4hYyYbi74yDkIKaecuhDWfo55fH1omCx2rU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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