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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1f76f52d71da650fdffca7bf05e7951bd89335bfeb8ad4bb321b864532fcb65' 
  AND token = '4A/2ZEkrV0al5nxubpqw5Bh2+zcInAz0U3ADaCp3siQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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