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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c7cf358a971f4f02bee53fa6702f4491dfb86d4b050589a9b5aa592f9189618' 
  AND token = 'BIOuZQ1s5AOtertzAyQ6+QblJt23QMRTEfeTA1W3ZQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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