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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8979d37499e53189c9724943aff2b5d18693372be388fa3adf37e0f431e377f0' 
  AND token = 'L1d9UawhDaShnCtjSrxDFcVRCzCNYiW41SqNIXIynkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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