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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db4f8fbb1359ba2d5d4cd291f80ec244160e84227ec9c84b30eaf55aa21512d' 
  AND token = 'pb9mPNG0gmhISpJIT9DKS66iiDyCDMoFqc0PilZDHpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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