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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3b661461e01310a32f1e950f7dce05a27de57ac871f066c909662cdc24c691' 
  AND token = '70GMMbnMu+HJ6rOov3dKrDw/zathKrA9ThGLrsK9/dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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