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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20137cdbf7bb8450a181c9ab84eb9136419c115742dc3b0e698b0476eff6f201' 
  AND token = 'sr4teV9ojljVj6szo69qbYjSfL92xZO4HYsYTj6i3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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