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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b050c8a343c7eb686939359bbb3d738a61887e163ebd501ebede1921f1235ea6' 
  AND token = 'DIcVyadnBGv6E2/txCEdvM9CPx9ccY3D19sa7i2AGsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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