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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72e4f3c756f86df23eed855d8d0862e4794bc3d96f6456fa9f39cc8a2ed2c639' 
  AND token = '9U0kuof2mjdxI2UKE+eNEYjmO5lPFp5kjBiQVfZRrBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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