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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95e1b42b0b9b9e5356cc03490504e382d626afee439977a50ee22bc5bfbc1f15' 
  AND token = 'PgJXiIk8tk2nhtXsMF43U3sJoq4+BKhfuLOhUhuRdw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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