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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dba840d27c2832800a277c4f2186bb1b64b388d133e01a43b8518ac87677cfa2' 
  AND token = 'UXBeD4hYSmGXccdHe90JlmAcTo9fS+ptcqaj6o4raf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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