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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b10f8c1a266cffdae4ff5112d05272f1a6c6fdc5ee315c971011ce4e5654ee9a' 
  AND token = '+9dVp5NZBrAkvf03blNT2eGX5/CXEWrJCAy2HWBVoqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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