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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa0bd6b317e44d844f5c757da0ca35af845b0bdde387b6e81367cabc89d0d12c' 
  AND token = 'GTp75QFqtR51VweAvXB+z3XfFexDavmT0aSuED/kJD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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