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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ce72777653ca316731b420c6ab6df10e388f28843265dd95d26616103007c6' 
  AND token = 'DfkMcUpuH5vdXXGKw+I0Fsew7Tce6Mu8vInwzmZu9zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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