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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be3d91c53889a0850639697aa6f2f28d2f23ed28a8aeb241b25a5ca02d78fe6' 
  AND token = 'y6uTLXG4AV24S+v67tr2y7gSQ5n2tE6FvHnkZtiHI0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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