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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd81d436d1dac5d4cfeca711d3ee855ae7b4af1dbb53bedb2f0d81e469bd358f3' 
  AND token = 'B5E018Ym4lqcrF1tFThbW4Z73MwHgdAhG1DzK5oOHLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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