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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22a8fdc2db891e7743f9895a4ad013b5d9abf46752ecd05ec53f8d1a5aaa5738' 
  AND token = 'iOBlwN2gba3Je9fW89XBvqkExjtClBb8BI3mZpGAnQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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