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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27a1c20ea5a86178e57407ebf46db4beff8c62d75fdeca7b77b1573551cf1d88' 
  AND token = 'LS+pzcZHCCJCMS3YBEPgz5APgnasjT/oHFiFK5SyCZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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