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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c186f10c576df2beae60cf533295b1a4b347944fe5e26733f49864aab57165c' 
  AND token = 'BBlZlehNGs28vu4r8GaYfkN2Hci2tJiyrlUVTXrCF4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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