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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b0ea42ca20c4c3d8f582c1422316bc6e4a7e22bd3db5b0a58151e16aa8c6c09' 
  AND token = 'YZ+iJR13hMTjrUD4RAmHbXFczkI8lxL2EDRl0ULl/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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