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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a02fe2e4383cf1efca732e3160e0759e41d5c38719d3fb3c9ec3f98fe70cd0' 
  AND token = 'SKnLjBoDs9VRCW2n8ETO+ew+2wnLydUvxD2qF9V0ko4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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