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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ea4b27eb254a6de508058741b67e5b708a42b7d3c29d69a768a0d22cda9b90a' 
  AND token = 'zb/DFzOQzVnAOm0lCJGzwesvT9jDOgIte0R2OUDEFOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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