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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb787f5fceda8cd9e576c16cfea18ccda3cf6f49ae63a0e8d0b791568f35f51' 
  AND token = 'Oj1eHDtUNPHypHOgXpIi0Qf2PZu7MmldSDuB9Sttia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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