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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f85d96277920fa48c99ed34736e628ad190df2a7c086a39a01bf3e63bcfab3f' 
  AND token = 'VG/KcRVHDLRGWF6pYp8Nja7AIeLOkMaq77GaPw8l72w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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