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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd580345bc545c2e5cbfffddc41a0f626d1bb815de5689cea06c34fe216780884' 
  AND token = 'ILIQMPXtzeb8kg2GTz8lmTtX5sMULQZbxmp3D01UfCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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