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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f1f3dde50ca9b156be05053532ef1d3a30c6ddaf28bb2f0cddfd15609a03aa' 
  AND token = '0cw6qvSPHzAzmIHoOzQ3lZxhzt4qMef1XJaBFpgmpSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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