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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25f8fa1d639aaf3d482407e44de7baaf426c94f4fb2c1fe7885578312b9de678' 
  AND token = 'gIhPP/h+G2CrZtrav+qwHgSkczN8etHdNtn1i8ilDRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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