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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab512af3ac5ee0b1131c19c5f2997a80a6f822b99c36910d11e32dc8ee24e4e0' 
  AND token = 'PmMRevHN5aAGHHbcRKO7xoo0q/mw8uIYpLAVTQ84Ok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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